What principles should be followed in machining

1. Workpiece after finishing: The main surface finishing (grinding, honing, lapping, rolling, etc.) should be carried out at the end of the process. The surface roughness after processing is Ra0.8um or more, and slight collisions will damage it. The surface is protected with fluffy cloth after finishing.


2. Dividing the processing stages: divide the surface with high quality requirements into processing stages, which can generally be divided into three stages: rough machining, semi-finishing and finishing. It is easy to arrange the heat treatment process that is mainly conducive to the reasonable use of equipment to ensure the processing quality, and it is easy to find blank defects and so on.


3. Machining the datum surface first: During the processing, the surface as the positioning datum is first processed to provide a correct datum for the subsequent processing. Called 'benchmark first.'


Four. Front and rear holes: For parts such as box body, bracket and connecting rod, the plane processing holes must be processed first. In this way, the hole can be positioned and processed in the plane, which ensures the positioning accuracy of the plane and the hole, and facilitates the processing of the hole on the plane.